摘要
轨道不平顺会加剧轮轨的动态作用,引起轮轨部件损坏、噪声等问题,一直是铁路维护工作的重点。考虑到维护的成本,对轨道不平顺程度的实时监测显得尤为重要,其中轴箱加速度信号的二次积分是使用较多的方法。然而轴箱加速度包含的成分复杂,为了更深入地认识轴箱加速度的测量结果,建立多车轮与轨道相互作用模型,详细分析轨道不平顺激励下的轴箱与转向架的动态位移响应,重点关注轴箱响应对轨道不平顺的可测性,并给出了扩大测量频率范围的建议。结果显示:低频(长波长)情况下轴箱对轨道不平顺的响应接近理想,但是高频的位移响应受到多车轮耦合作用的影响,呈现很大的不确定性。
Track irregularities can aggravate wheel/rail interaction and thus induce fatigue and damage of wheel/railcomponents and noise.This is always the key point of track maintenance.Considering the economy of maintenance work,real-time monitoring of track unevenness becomes very important.The most frequently used method of track unevennessmonitoring is the double integrating of the axle-box acceleration.Unfortunately,the axle-box response is found to beinfluenced by various factors.To obtain a better understanding of measurement results,the dynamic behavior of the axle-boxresponse to the unevenness excitation due to multiple wheel/rail interactions is analyzed in frequency domain with the“moving irregularity”model.Based on the analysis of the axle-box response,the measurability of track unevenness isdiscussed.Results show that the response of the axle-box to track unevenness at low frequencies is nearly ideal,whereas athigh frequencies it is influenced by the standing waves formed among the wheels and shows a variety of uncertainty due towave reflections.Finally,some suggestions for extending the range of measurable wavelength are proposed.
作者
方格
吴天行
彭志科
王誉蓉
FANG Ge;WU Tian-xing;PENG Zhi-ke;WANG Yu-rong(State Key Laboratory of Mechanical System and Vibration, Shanghai Jiaotong University,Shanghai 200240, China)
出处
《噪声与振动控制》
CSCD
2017年第2期13-17,100,共6页
Noise and Vibration Control
基金
国家自然科学基金资助项目(11572188
11472170)
关键词
振动与波
轨道不平顺
轴箱加速度
多车轮作用
驻波
vibration and wave
track irregularity
axle-box acceleration
multiple wheels interaction
standing wave
